JPS6035174A - Ignition device for internal-combustion engine - Google Patents

Abstract

PURPOSE:To prevent error action and to obtain wide ignition lead angle range by controlling electrification of an ignition coil by producing logic consisting of a cylinder discriminating signal which is changed over at the point of change of the reference edge of an ignition signal and the ignition signal itself. CONSTITUTION:An ignition signal sensor 1 and a cylinder discriminating sensor 2 are provided and the output of the sensor 1 is input to an ignition timing control circuit 4 after wave shape correction 3. Next the output signal C of this circuit 4 is fed to a detecting circuit of the number of engine rotation 13 to generate output frequency of input signal C, that is a voltage corresponding to the speed of engine rotation and the voltage is compared with the set voltage. When the speed of the engine rotation is higher than the set speed of rotation, the output of the detecting circuit 13 becomes ''0'' and both outputs of AND circuits 14, 15 are also made ''0''. Then the output of J-K/FF16 is inverted every rise of wave shape of the said signal C and delayed slightly in a delay circuit 17, and fed to the AND circuits 5, 6 to obtain logic with the signal C, and electrification of an ignition coil 11 is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field Used in Industry] The present invention relates to an ignition device for an internal combustion engine, and particularly to an ignition device for an internal combustion engine that is useful when electronically controlling ignition timing. Furthermore, depending on the number of cylinders shown in Japanese Patent Application Laid-Open No. 55-37536, (1) a non-distribution electronic type using one or more simultaneous ignition coils, or a non-distribution electronic type shown in Japanese Patent Application Laid-Open No. 56-14861. The present invention relates to an ignition system for an internal combustion engine suitable for use in combination with a diode rotor distribution type in which the high voltage diode is built in a power distribution rotor.

[Prior art]

First, a conventional example will be explained with reference to FIG. In FIG. 1, 1 is an ignition signal sensor, for example, an electromagnetic pickup, and 2 is a cylinder discrimination sensor, for example, a position sensor using a Hall effect element. 3 is a waveform shaping circuit that shapes the waveform of the ignition signal output; 4 is an ignition timing control circuit that electronically controls the ignition timing based on the ignition signal output; 5 and 6 are AND circuits;
Based on the output signal of the cylinder control sensor 2, a distribution signal for distributing and operating each transistor 7 and 9 is generated. 8 and 10 are backflow blocking diodes,
11 is an ignition coil, 12 is an ignition power distributor, and two high-voltage diodes 12a (2) and 12b are used to perform two-system power distribution.

Next, the operation of the above configuration will be explained with reference to the operation waveform diagram shown in FIG. 2. In addition, in Fig. 2, (A) to (
Each waveform in E) shows each waveform of the portion with the same reference numeral in FIG.

First, considering the ignition timing control signal that is advanced by a predetermined angle as shown in the waveform (C) with respect to the ignition signal of the waveform (A>), the distribution signal logically calculated with the cylinder discrimination signal shown in the waveform (B) is (D
) and (E) waveforms, it can be seen that malfunctions occur as shown in the areas surrounded by thin lines.

In other words, the ignition signal after controlling the ignition timing is the cylinder discrimination signal at an angle that includes the entire energized section within the range of each phase: θON
There is a problem in that the ignition timing can only be controlled within the range covered by the ignition timing, and beyond that the ignition timing will malfunction as described above.

[Object of the present invention]

An object of the present invention (3) is to provide an ignition system that can greatly improve engine performance by expanding the ignition timing control range by preventing the malfunctions described above.

[Example of the present invention]

Next, an embodiment of the present invention will be described with reference to the electric circuit diagram shown in FIG. 3 and the operational waveform diagram shown in FIG. 4. In FIG. 3, parts with the same reference numerals as those in FIG. 1 indicate the same or equivalent parts.

Reference numeral 13 denotes an engine rotation speed detection circuit which creates an analog voltage according to the output frequency of the ignition timing control signal, that is, the engine rotation speed, and generates a signal of aO'' when the rotation speed is above a predetermined rotation speed, and 1'' when the rotation speed is below a predetermined rotation speed. It consists of an F/V converter 1.38 and a comparator 13b.

Next, 14 and 15 are AND circuits, 16 is a master-slave flip-flop (hereinafter referred to as 1- flip-flop), 17 is a delay circuit, and 18 to 21 are N07 circuits.

Next, the operation of the above configuration will be explained with reference to the operation waveform diagram shown in FIG. 4.

First, if the engine rotation speed is higher than the set rotation speed of the engine rotation speed detection circuit 13, the engine rotation speed setting circuit 13
Since the output of is 0'', the outputs of both A(4) ND circuits 14 and 15 are both 0''. Therefore, J
−, the Q output of the flip-flop 16 is the clock pulse (
CP) It is inverted each time the input rises, that is, the (C) waveform falls, and an output as shown in the (D) waveform is obtained. Then, since the Q output of the flip-flop 16 is output to the post-AND circuits 5 and 6 which are slightly delayed by the delay circuit 17 at this J-, the cylinder discrimination signal shown in the waveform (B) is always (D
) is processed into a cylinder discrimination signal shown in the waveform, and there is no malfunction like in the past. Therefore, the retard range of the ignition timing is completely free within the range in which the fall of the ignition timing control signal falls within the base cylinder discrimination signal shown in the waveform (B), and a wide advance range can be obtained.

In addition, to explain the operation of the engine speed detection circuit 13 and the AND circuits 14 and 15, when the engine is started, one power transistor 7 or the other power transistor is switched until the fall of the ignition timing control signal (C) waveform occurs. I don't know which one will be energized, 9 or 9. Therefore, at the time of aircraft start-up, there is a risk that only one shot will catch fire in the opposite cylinder. Therefore, the engine rotation speed is detected (5), and while the rotation is low, the flip-flop 16 is cleared ( The cylinder discrimination signal is created using the CL) input and the preset (PR) input.

In the embodiments described above, an example was explained in which the flip-flop 16 was used as a flip-flop in J-, but the present invention is not limited to this, and examples in which similar operations can be performed are well known.

In addition, in this embodiment, the rotation speed detection circuit is used to detect the starting time as a method of dealing with starting. However, the present invention is not limited to this. It goes without saying that similar effects can be expected by detection.

[Effects of the present invention]

As described above, in the present invention, the ignition signal generation means generates an ignition signal in synchronization with the rotation of the engine, and the cylinder (6) discrimination signal generation means generates a cylinder discrimination signal having a cycle twice that of the ignition signal. With these two signals as input, the cylinder discrimination signal generation logic circuit means reprocesses them into a cylinder discrimination signal that switches at the change point of the reference edge of the ignition signal, and also processes the output signal of the cylinder discrimination signal generation logic circuit means and the ignition signal. Because it uses logic to control the energization of the ignition coil,
With ignition timing control, even if the phase of the ignition signal changes significantly, the phase of the cylinder discrimination signal will also change accordingly, ensuring the distribution of the ignition signal, thereby ensuring wide ignition without malfunction. This has the excellent effect of being able to obtain a range of advance angles.

[Brief explanation of the drawing]

Figure 1 is an electrical circuit diagram showing the conventional device, and Figure 2 is the electrical circuit diagram of the conventional device.
FIG. 3 is an electric circuit diagram showing one embodiment of the device of the present invention, and FIG. 4 is a waveform diagram of each part to explain the operation of the above embodiment. 1.3.4... Ignition signal sensor, waveform shaping circuit 1, ignition timing control circuit, 2... composing the ignition signal generating means
Cylinder discrimination sensor (7) constituting cylinder discrimination signal generation means, 5, 6.21...AND circuit and NOT circuit forming energization signal generation logic circuit means, 11...Ignition coil, 16.17, 18.20... A flip-flop, a retard circuit, and a NOT circuit in J-, which constitutes the cylinder discrimination signal generation logic circuit means. Representative Patent Attorney Takashi Okabe (8)

Claims (1)

[Claims] An ignition signal generating means generates an ignition signal synchronized with the rotation of the engine, a cylinder discrimination signal generating means generates a cylinder discrimination signal having twice the period of the ignition signal, and the reference edge of the ignition signal is determined by inputting both signals. Controls energization of the ignition coil by performing logic between a cylinder discrimination signal generation logic circuit means that reprocesses the cylinder discrimination signal to a cylinder discrimination signal that switches at a change point, and an output signal of the cylinder discrimination signal generation logic circuit means and the ignition signal. An ignition device for an internal combustion engine, comprising energization signal generation logic circuit means.